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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8faf0a3ada190a6ae35d0d6eef046eeee9b4d7c2bb2e568172862a516798c3' 
  AND token = 'TD99D1TTkYh/V5bDcOdFHAjG5rZn5wyRwxDt++RJ/WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}